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Titration of oxygen on a polycrystalline iron surface by permeating hydrogen. Interim report, 1 March 1986-28 February 1988

Technical Report ·
OSTI ID:6667053
;
The interaction between oxygen and hydrogen on a clean polycrystalline iron surface was studied by Auger electron spectroscopy and mass spectrometry. To avoid having the reaction kinetics limited by the slow adsorption of hydrogen on the oxidized surface, hydrogen was supplied by permeation through the thin iron specimen. For oxygen coverages of more than one monolayer, this procedure resulted in the rapid titration of oxygen by the formation and desorption of water. In the temperature range of 475-625 K, the reaction path consists of the initial formation of OH from coadsorbed oxygen and hydrogen, followed by the disproportionation of two hydroxyl species to form H/sub 2/O. An overall activation energy of 7-8 Kcal/mole was measured for the above reaction sequence. Oxygen in coverages of less than one monolayer could not be removed by hydrogenation, in agreement with a previous study on an Fe(100) single crystal substrate. This present study shows that this apparent stability of the chemisorbed oxygen is not due to the kinetics of hydrogen adsorption.
Research Organization:
Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Materials Engineering
OSTI ID:
6667053
Report Number(s):
AD-A-196490/7/XAB; TR-7
Country of Publication:
United States
Language:
English

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Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DESORPTION
DOCUMENT TYPES
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
HYDROGEN
HYDROGENATION
IRON
KINETICS
METALS
NONMETALS
OXIDATION
OXYGEN
PROGRESS REPORT
REACTION KINETICS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
STABILITY
SURFACE PROPERTIES
SURFACES
TITRATION
TRANSITION ELEMENTS